Question: What year was the final product of DC-8 made?
Paraphrase: The final product of DC-8 was made in what year?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q223315 wdt:P176 ?X . ?X wdt:P576 ?answer}
Answer: 1997-01-01T00:00:00Z, 1967-01-01T00:00:00Z